batgrbproduct Analysis for Trigger=680655
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Mar 28 07:14:58 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger680655/GCN5_download_cron
======================================================================
Trigger: 00680655 Segment: 000
BAT Trigger Time: 480762983.744 [s; MET]
Trigger Stop: 480762984.768 [s; MET]
UTC: 2016-03-27T09:16:07.705440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 146.689296300309 Dec: 54.0168224464118 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.6
Image Trigger?: NO
Rate S/N Ratio: 12.0830459735946 [ if not an image trigger ]
Image S/N Ratio: 7.6
Flight Position: [ source = BAT ]
RA: 146.689296300309 Dec: 54.0168224464118 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 146.697924775871 Dec: 54.0177680901612 [deg; J2000]
{ 09h 46m 47.5s , +54d 01' 04.0" }
+/- 0.956215428771884 [arcmin] (estimated 90% radius based on SNR)
+/- 0.321968359656109 [arcmin] (formal 1-sigma fit error)
SNR: 32.4261871150337
Angular difference between Flight and Ground position is 0.309422 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 27.7639999389648 +/- 9.22542076482328
Measured from: -3.31199991703033
to: 24.4520000219345 [s; relative to TRIGTIME]
T50: 9.81199991703033 +/- 1.28893130689523
Measured from: 3.08800011873245
to: 12.9000000357628 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.13999998569489
to: 5.13999998569489 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.2960000038147
to: 42.8039999604225 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.917988 0.908100 0.588320 0.092607
0.040182 0.041817 0.036413 0.032121 [error]
Peak 0.064826 0.081552 0.064512 -0.000226
0.006791 0.007123 0.006368 0.005054 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 2.61e-07 3.90e-07 4.36e-07 9.22e-07 1.36e-06 2.01e-06 erg/cm2
Error 2.31e-08 2.07e-08 3.68e-08 1.65e-07 8.29e-08 1.95e-07 erg/cm2
Peak flux Power-law 6.13e-01 5.85e-01 3.88e-01 4.01e-01 1.75e+00 1.99e+00 ph/cm2/s
Error 9.15e-02 5.67e-02 5.10e-02 1.03e-01 1.67e-01 1.94e-01 ph/cm2/s
Fluence Cutoff-PL 2.61e-07 3.90e-07 4.36e-07 9.13e-07 1.36e-06 2.00e-06 erg/cm2
Error 2.41e-08 2.05e-08 3.67e-08 2.85e-07 8.66e-08 3.02e-07 erg/cm2
Peak flux Cutoff-PL 5.52e-01 6.34e-01 4.03e-01 1.72e-01 1.70e+00 1.76e+00 ph/cm2/s
Error 1.05e-01 7.20e-02 5.74e-02 1.34e-01 1.71e-01 2.14e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.56e-01 6.29e-01 4.03e-01 1.87e-01 1.71e+00 1.78e+00 ph/cm2/s
Error 1.00e-01 7.17e-02 5.35e-02 -------- 1.71e-01 1.90e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.840 0.106 - - 3.02e-03 1.81e-04 51.870 57
CPL 1.832 0.380 953.2 0.0 3.05e-03 0.00e+00 51.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.591 0.162 - - 1.36e-02 1.40e-03 57.520 57
CPL 0.846 0.687 72.2 71.2 3.42e-02 3.40e-02 53.370 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 22.016000 sec.
T50 in the 50-300 keV band: 6.016000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 49.100 -6.296 42.804
T90 27.764 -3.312 24.452
T50 9.812 3.088 12.900
Peak 1.000 4.140 5.140
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
146.6979 +54.0178 0.0060 16.5 -85.8 1.5404 32.4 TRIG_00680655
------------------------------------------
Foreground time interval of the image:
-6.296 8.557 (delta_t = 14.853 [sec])
Background time interval of the image:
-239.744 -168.584 (delta_t = 71.160 [sec])
-167.744 -6.296 (delta_t = 161.448 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -6.296 sec. to 42.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83961 ( -0.104851 0.106834 )
Norm@50keV : 3.02285E-03 ( -0.000181919 0.000179922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.87 using 59 PHA bins.
# Reduced chi-squared = 0.9099 for 57 degrees of freedom
# Null hypothesis probability = 6.675685e-01
Photon flux (15-150 keV) in 49.1 sec: 0.423111 ( -0.0229314 0.0229891 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36494e-06 ( -8.25636e-08 8.33006e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.296 sec. to 42.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83208 ( -0.338457 0.421756 )
Epeak [keV] : 953.228 ( )
Norm@50keV : 3.04985E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.88 using 59 PHA bins.
# Reduced chi-squared = 0.9264 for 56 degrees of freedom
# Null hypothesis probability = 6.315312e-01
Photon flux (15-150 keV) in 49.1 sec: 0.423110 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3645e-06 ( -9.04717e-08 8.26549e-08 ) ergs/cm2
Band function
Time interval is from -6.296 sec. to 42.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45809 ( 1.46072 1.46072 )
beta : -1.83897 ( 1.83919 0.104473 )
Epeak [keV] : 22.2234 ( -18.64 -18.64 )
Norm@50keV : 6.89183E-03 ( -0.00422411 0.18162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.87 using 59 PHA bins.
# Reduced chi-squared = 0.9431 for 55 degrees of freedom
# Null hypothesis probability = 5.949424e-01
Photon flux (15-150 keV) in 49.1 sec: 0.419235 ( 6.58076 -0.419235 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7660 ( )
R^2/D10^2 : 0.102287 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 155.20 using 59 PHA bins.
# Reduced chi-squared = 2.7228 for 57 degrees of freedom
# Null hypothesis probability = 4.980127e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.468e-07 1.490e-08
25- 50 4.513e-07 2.917e-08
50-150 3.706e-07 5.212e-08
15-150 9.686e-07 6.064e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9805 (-19.5016 28.632)
Norm : 1.83269 (-0.144594 0.16317)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.419159e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.352e-07 2.219e-08
25- 50 4.067e-07 2.789e-08
50-150 6.590e-07 1.947e-07
15-150 1.301e-06 2.043e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.63938 (-0.888314 1.00308)
R1^2/D10^2 : 1.18058 (-0.543261 1.18302)
kT2 [keV] : 22.3123 (-3.45373 5.15961)
R2^2/D10^2 : 7.70179E-03 (-0.00409752 0.00688101)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.06 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.724580e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.575e-07 4.890e-08
25- 50 3.781e-07 5.128e-08
50-150 7.003e-07 1.477e-07
15-150 1.336e-06 1.971e-07
Peak spectrum fit
Power-law model
Time interval is from 4.140 sec. to 5.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59083 ( -0.159876 0.163389 )
Norm@50keV : 1.36481E-02 ( -0.001407 0.00139232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.52 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.556597e-01
Photon flux (15-150 keV) in 1 sec: 1.74890 ( -0.166622 0.16668 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27783e-07 ( -1.41761e-08 1.43713e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.140 sec. to 5.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.846145 ( -0.741084 0.632818 )
Epeak [keV] : 72.2370 ( -17.607 124.869 )
Norm@50keV : 3.41993E-02 ( -0.0182101 0.0498363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9530 for 56 degrees of freedom
# Null hypothesis probability = 5.751723e-01
Photon flux (15-150 keV) in 1 sec: 1.70208 ( -0.1712 0.17118 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19958e-07 ( -1.5406e-08 1.5772e-08 ) ergs/cm2
Band function
Time interval is from 4.140 sec. to 5.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.846059 ( -0.511721 0.901 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 72.2218 ( -17.6 124.668 )
Norm@50keV : 3.42014E-02 ( -0.0342013 0.0499705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9703 for 55 degrees of freedom
# Null hypothesis probability = 5.372621e-01
Photon flux (15-150 keV) in 1 sec: 1.70788 ( 5.29212 -0.17628 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19821e-07 ( -1.19814e-07 -1.5995e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2437 (-1.54592 1.77225)
R^2/D10^2 : 0.307415 (-0.110866 0.171437)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.46 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 57 degrees of freedom
# Null hypothesis probability = 8.145894e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.143e-08 2.103e-09
25- 50 4.016e-08 5.035e-09
50-150 4.501e-08 9.580e-09
15-150 9.660e-08 1.240e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 160.757 (-57.0055 -160.698)
Norm : 7.24889 (-0.731442 0.834963)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.51 using 59 PHA bins.
# Reduced chi-squared = 0.9564 for 57 degrees of freedom
# Null hypothesis probability = 5.689279e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.850e-08 4.555e-09
25- 50 3.463e-08 1.237e-08
50-150 7.029e-08 3.885e-08
15-150 1.234e-07 6.104e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.67797 (-1.93394 2.22611)
R1^2/D10^2 : 2.05789 (-1.21441 4.21107)
kT2 [keV] : 21.8176 (-4.86335 9.64645)
R2^2/D10^2 : 3.92723E-02 (-0.0296506 0.0679038)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.01 using 59 PHA bins.
# Reduced chi-squared = 0.9457 for 55 degrees of freedom
# Null hypothesis probability = 5.894841e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.747e-08 8.575e-09
25- 50 3.575e-08 1.363e-08
50-150 6.741e-08 3.537e-08
15-150 1.206e-07 5.523e-08
Plot creation:
Mon Mar 28 07:19:25 EDT 2016